You Saved Science
Complete all test chambers in all courses of co-op
100 
Smash TV
Break 11 test chamber monitors
75 
Professor Portal
After completing co-op, complete Calibration Course online with a friend who hasn’t played before
75 
Friends List With Benefits
While playing co-op, hug 3 different people on your friends list
50 
Overclocker
Complete Test Chamber 10 in 70 seconds
30 
Pit Boss
Show that pit who's boss
30 
Empty Gesture
Drop your co-op partner in goo while they are gesturing by removing the bridge under them
25 
Party of Three
Find the hidden companion cube in co-op test chamber
25 
Narbacular Drop
Place a portal under your co-op partner while they are gesturing
25 
Four Ring Circus
Enter 4 different portals without touching the ground in co-op
25 
The Part Where He Kills You
This is that part
20 
Lunacy
That just happened
20 
Drop Box
Place a cube on a button without touching the cube
20 
Preservation of Mass
Break the rules in Test Chamber 07
20 
Final Transmission
Find the hidden signal in one of the Rat Man's dens
20 
Schrodinger's Catch
Catch a blue-painted box before it touches the ground
20 
Door Prize
Examine all the vitrified test chamber doors
20 
Iron Grip
Never lose a cube in Chamber 6 of the Mass and Velocity co-op course
20 
Air Show
Perform 2 aerial gestures before touching the ground in co-op
20 
Portal Conservation Society
Complete Chamber 3 in the Hard-Light Surfaces co-op course using only 5 total portal placements
20 
Rock Portal Scissors
Win 3 co-op games of rock-paper-scissors in a row
20 
White Out
Complete the first Conversion Gel test
15 
Tunnel of Funnel
Master the Excursion Funnel
15 
Dual Pit Experiment
Do the same test twice
15 
Bridge Building
Complete all test chambers in the Hard-Light Surfaces co-op course
15 
Obstacle Building
Complete all test chambers in the Excursion Funnels co-op course
15 
Gesticul-8
Perform all 8 gestures of your own volition in co-op
15 
Triple Crown
Solve 3 co-op chambers in the Mass and Velocity course in under 60 seconds each
15 
Still Alive
Complete Course 4 with neither you nor your co-op partner dying
15 
Stalemate Associate
Press the button!
15 
Tater Tote
Carry science forward
15 
Vertically Unchallenged
Master the Repulsion Gel
15 
Stranger Than Friction
Master the Propulsion Gel
15 
No Hard Feelings
Save a turret from redemption
10 
Ship Overboard
Discover the missing experiment
10 
Portrait of a Lady
Find a hidden portrait
10 
You Made Your Point
Refuse to solve the first test in Chapter 8
10 
Undiscouraged
Complete the first Thermal Discouragement Beam test
10 
Team Building
Complete all test chambers in the Team Building co-op course
10 
Confidence Building
Complete all test chambers in the Mass and Velocity co-op course
10 
Can't Touch This
Dance in front of a turret blocked by a hard light bridge in co-op
10 
Bridge Over Troubling Water
Complete the first Hard Light Bridge test
10 
Asking for Trouble
Taunt GLaDOS in front of a camera in each of the five co-op courses
10 
SaBOTour
Make a break for it
10 
Wake Up Call
Survive the manual override
5 
Pturretdactyl
Use an Aerial Faith Plate to launch a turret
5 
You Monster
Reunite with GLaDOS
5 
Good Listener
Take GLaDOS' escape advice
5 
Scanned Alone
Stand in a defective turret detector
5 
High Five
Celebrate your cooperative calibration success
5